Alright, let's work through 4991 times 2080 step by step
4991 × 2080 = 2080 × (4991)
+ 2080 × 1 which equals 2080
+ 2080 × 90 that results in 187200
+ 2080 × 900 that is equal 1872000
+ 2080 × 4000 what gives us 8320000

= 10381280
